Valve.



No. 802,239. PATENTED OCT. 17, 1905. E. F. RIDDLE.

VALVE.

APPLICATION FILED APR. 22, 1905.

ATTORNEYS rrp lll Ta llE awa TTOE.

VALVE.

Specification of Letters Patent.

Patented Oct. 17, 1905.

Application filed April 22,1905. Serial No. 256,890.

To (tZZ whom it may concern:

Be it known that I, EDWIN FRANCIS RIDDLE, a citizen of the United States, residing at Wellsville, in the county of Columbiana and State of Ohio, have made certain new and useful Improvements in Valves, of which the fol lowing is a specification.

This invention is an automatic gas-cut-olf valve acting by gravity to close when the gas supply and pressure is shut 06? or fails, and when once closed the valve stays closed until opened by hand.

The valve is of that type having a sliding plug which when the valve is open and the gas-pressure is on is supported in raised and open position by the gas-pressure beneath and which drops to closed position when the pressure fails.

The object of the invention is to produce a Valve of the kind stated which will be quick and certain in operation and which will not leak in either open or closed position. It is also characterized by the facts that when open the valve does not reduce or obstruct the gas passage or pressure, that it is simple in construction and neat in appearance, and has other advantages, as will more fully appear from the following description.

In the accompanying drawings, Figure 1 is a longitudinal vertical section of the valve closed. Fig. 2 is an end view of the valve, and Fig. 3 is a top plan View thereof.

Referring specifically to the drawings, M indicates the valve-casing, threaded at opposite ends, as at m, for connection of the service pipes, and it may be remarked in this connection that the valve is the same on both sides, and consequently may be connected with either end toward the burners.

K is the valve-chamber, containing the sliding plug C. This chamber is of uniform diameter in its upper part above the gas-passage; but its lower part tapers to a smaller diameter at the bottom. The chamber is closed at the top by a screw-cap D, which has a valve-seat Gr for the open position of the valve and also an annular recess 9, into which air may enter through a vent in the valve stem, so that a vacuum is avoided when the valve-plug drops.

The body of the valve-plug C is ground and tapered to fit the tapering part of the chamber K to avoid leak when closed, but at the upper end has a straight or true cylindrical portion E, which has a nice fit in the upper or cylindrical portion of the chamber K and forms aguide forthe movement of the plug. The top of the-plug is beveled and ground to lit the seat G in the cap, so that a gas-tight joint with the cap is effected when the plug is lifted. Furthermore, the plug C is hollow to make it light, sothat it will not require great pressure to sustain it. The stem B, connected to the plug, extends loosely through the cap and has an axial bore I, which opens laterally at the top through a port 11 above the cap and at the bottom near the head of the plug through a port a, and at the top the stem has a button A for convenience of manipulation.

When the valve is closed, as shown in Fig. 1, there is a space L in the bottom of the chamber below the plug. This permits a tight closure and also in connection with the hollow in the plug, which is open at the lower end, gives a comparatively large space, which reduces to a minimum the degree of compression of gas caught under the plug when it drops and allows the plug to seat firmly. This is of importance in tightly closing the valve and preventing any possible lift thereof by returning gas-pressure. Also the space allows room for the collection of dirt or water, which if the valve closed against the bottom of the chamber would in such case prevent tight closure and permit leak or allow the valve to lift if pressure should return. Foreign matter collecting in said space may be blown out through the pet-cock J.

In use the valve-plug is lifted by hand to contact with the upper seat G, and is held there by the gas-pressure below. If and when the pressure fails the plug drops by gravity, the air vented through the passage 1 insures a quick drop and tight seat in the tapered bore, and the valve will stay closed until again lifted by hand. The absence of leak and certainty of operation, so essential in devices of this kind, are features of the invention.

Having thus described the invention, What I claim as new, and desire to secure by Letters Patent, is-

1. A cut-ofl valve, comprising a casing having a chamber with parallel walls in the upper part and tapered in the lower part across the main passage in the casing, and a plug slidable up and down in the chamber and having an upper portion with parallel sides to fit the parallel walls of the casin g and a lower tapered.

portion, adapted to respectively fit said parts and to drop by gravity and close the said passage.

IIO

2. A cut-ofi valve comprising a casing having valve-seats attop and bottom, anda-plug open at its bottom and closed at its top and slidable up and down in the chamber to contact at its lower end with the lower seat, and to contact at its upperend with the upper seat.

3. A cut-0H valve comprisingacasing havinga chamber with a tapered valve-seat extending across the main passage, a cap over the chamber havinga taperedseat: at; the top thereof, a plug tapered at1top and bottom to fit said seats. and having a stem extending through the cap, with an air-inletto the chamber above the plug.-

4. A cut-off valve comprising a casing hav- 5 ing atapered chamber extending across the main passage and valve-seats at upper and lower ends of said chamber, and a tapered plug slidable up and down in the chamber to contact, With the respective seats, the plug 20 

